Dr Brown\'s Options+ Level 4 Wide-Neck Teats have a scalloped base which allows air to vent through the bottle, even when the vent system is not used. Level 4 is a fast flow teat, designed for babies who are more developed or prefer a quick flow.The teats are made from high grade, super soft silicone. Dishwasher (top rack) and steriliser safe, BPA-free. Suitable for babies aged 9+ months. Dr Brown\'s Options+ Level 4 Wide-Neck Teats are made of soft silicone to imitate the feel of the breast. Both teats are suitable for babies aged 9+. The fast flow teats ideal for thicker liquids, are for use with Dr Brown\'s wide-neck options bottles in which the anti-colic vent system is clinically proven to reduce colic. The teats are contoured and breast-like so that it helps your baby latch on for a more natural bottle-feeding experience. Dishwasher (top rack) and s iser safe. BPA-free. Key Features include: Level 4 teat, twin pack Suitable for babies aged 9+ months Made from super soft silicone Contoured and breast like for a natural feeding experience Dishwasher safe BPA free For use on the Dr Brown\'s Options+ Wide-Neck bottles only